R. L. Boudrie

0.8 GeV p + Pb 208 elastic scattering and the quantity Δ r np

Analyses of 0.8 and 1 GeV p+/sup 208/Pb elastic angular distribution data have obtained neutron-proton root-mean-square radius differences (..delta..r/sub n/p) which are not consistent. Therefore, the 0.8 GeV experiment was repeated using a high resolution spectrometer. The new higher precision data are consistent with the older data, apart from a 15% overall normalization difference. A second order Kerman-McManus-Thaler optical model analysis of the new data, using a model-independent neutron density, yields ..delta..r/sub n/p=0.14 +- 0.04 fm, in good agreement with the most recent result obtained (0.16 +- 0.05 fm) from a similar analysis of the older 0.8 GeV data. In addition, the elastic angular distribution was extended to 42.5/sup 0/ center of mass in order to explore the momentum transfer region from 3.5 to 5.3 fm/sup -1/. Although the familiar diffraction pattern persists to 42.5/sup 0/, it was not possible within the framework of our application of the Kerman-McManus-Thaler optical model to fit the data even qualitatively at the larger momentum transfers.

Analyzing powers for the π − p → → π 0 n reaction across the Δ ( 1232 ) resonance

High quality analyzing powers for the {pi}{sup {minus}}{rvec p}{r_arrow}{pi}{sup 0}n reaction have been obtained with a polarized proton target over a broad angular range at incident kinetic energies of 98.1, 138.8, 165.9, and 214.4 MeV. This experiment nearly doubled the existing {pi}N single-charge-exchange database for energies ranging from 10 to 230 MeV, with 36 new analyzing powers. The Neutral Meson Spectrometer was used to detect the outgoing neutral pions. The data are well described by recent phase-shift analyses. When combined with high-precision and accurate cross section data at the same energies, the data can provide a good test of the degree of isospin breaking in the region of the {Delta}(1232) resonance. They will also be helpful for constraining the evaluation of the pion-nucleon {sigma} term from the scattering amplitudes. {copyright} {ital 1999} {ital The American Physical Society}High quality analyzing powers for the

Analyzing powers for the {pi}{sup {minus}}{rvec p}{r_arrow}{pi}{sup 0}n reaction across the {Delta}(1232) resonance

{\ensuremath{\pi}}^{\ensuremath{-}}\stackrel{\ensuremath{\rightarrow}}{p}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{0}n

Large angle elastic and inelastic scattering of protons from Ca 40 at 800 MeV

reaction have been obtained with a polarized proton target over a broad angular range at incident kinetic energies of 98.1, 138.8, 165.9, and 214.4 MeV. This experiment nearly doubled the existing

Inelastic pion scattering from 12C.

\ensuremath{\pi}N

Elastic and inelastic scattering of 291-MeV pions by /sup 9/Be, Si, /sup 58/Ni, and /sup 208/Pb

single-charge-exchange database for energies ranging from 10 to 230 MeV, with 36 new analyzing powers. The Neutral Meson Spectrometer was used to detect the outgoing neutral pions. The data are well described by recent phase-shift analyses. When combined with high-precision and accurate cross section data at the same energies, the data can provide a good test of the degree of isospin breaking in the region of the

Elastic scattering of 30 MeV positive and negative pions from nickel isotopes

\ensuremath{\Delta}(1232)

Isospin asymmetries in pion scattering to isoscalar giant quadrupole states in Ni isotopes

resonance. They will also be helpful for constraining the evaluation of the pion-nucleon

Indication of pionic-atom anomalies in pion-nucleus elastic scattering

\ensuremath{\sigma}

Pion scattering and absorption contributions to proton emission from pion-nucleus collisions at T/sub. pi. / = 50--295 MeV

term from the scattering amplitudes.